// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#if V8_TARGET_ARCH_ARM64

#include "src/debug/debug.h"

#include "src/arm64/macro-assembler-arm64-inl.h"
#include "src/debug/liveedit.h"
#include "src/frame-constants.h"
#include "src/frames-inl.h"
#include "src/objects-inl.h"

namespace v8 {
namespace internal {

#define __ ACCESS_MASM(masm)

    void DebugCodegen::GenerateHandleDebuggerStatement(MacroAssembler* masm)
    {
        {
            FrameScope scope(masm, StackFrame::INTERNAL);
            __ CallRuntime(Runtime::kHandleDebuggerStatement, 0);
        }
        __ MaybeDropFrames();

        // Return to caller.
        __ Ret();
    }

    void DebugCodegen::GenerateFrameDropperTrampoline(MacroAssembler* masm)
    {
        // Frame is being dropped:
        // - Drop to the target frame specified by x1.
        // - Look up current function on the frame.
        // - Leave the frame.
        // - Restart the frame by calling the function.
        __ Mov(fp, x1);
        __ Ldr(x1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));

        __ Mov(sp, fp);
        __ Pop(fp, lr); // Frame, Return address.

        __ LoadTaggedPointerField(
            x0, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
        __ Ldrh(x0,
            FieldMemOperand(x0, SharedFunctionInfo::kFormalParameterCountOffset));
        __ mov(x2, x0);

        ParameterCount dummy1(x2);
        ParameterCount dummy2(x0);
        __ InvokeFunction(x1, dummy1, dummy2, JUMP_FUNCTION);
    }

    const bool LiveEdit::kFrameDropperSupported = true;

} // namespace internal
} // namespace v8

#undef __

#endif // V8_TARGET_ARCH_ARM64
